HERC5 ISG15结合酶的细胞标和氨酸选择性
Xu Zhao1, Jessica M Perez1, Peter A Faull2
1Department of Molecular Biosciences, University of Texas at Austin, Austin, TX 78712, USA.
iScience
|February 2, 2024
概括
这项研究确定了人类ISG15结合酶hHERC5.5在1,100种蛋白质上的2000多个ISGylation位点. 研究人员还发现人类和小鼠ISG15连接酶之间存在明显的基质偏好,这影响了先天免疫研究.
科学领域:
- 生物化学 生物化学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 干扰素刺激基因15 (ISG15) 是一种类似于泛素的修饰剂,对先天免疫反应至关重要.
- E3 泛基因酶hHERC5 是人类ISG15结合的主要酶,作用于核糖体相关蛋白质.
- 了解ISG15结合机制及其目标对于破译细胞防御机制至关重要.
研究的目的:
- 为了全面描述由hHERC5.5介导的人类ISG15修饰蛋白质组 (ISGylome) 的特征.
- 为了比较人类hHERC5的基质选择性与它的小鼠正体,mHERC6.6.
- 为了研究由ISG15连接酶对蛋白质的配翻译性修饰.
主要方法:
- 基于质谱的蛋白质组学来识别ISGylated蛋白质和站点.
- 围绕已识别的ISGylation站点周围的氨基酸序列的生物信息分析.
- 人类 (IFN-β刺激) 和小鼠细胞之间的ISGylation模式的比较.
主要成果:
- 在人体细胞中的1,100多种蛋白质中,已经确定了2000多个独特的ISGylation位点.
- 对于hHERC5和mHERC6观察到不同的氨基酸序列偏好,表明不同的基质识别.
- 证据支持由hHERC5和mHERC6.6共同翻译ISGylation新生的多链.
结论:
- 这项研究提供了迄今为止最大的ISGylome数据集,显著扩大了单个Ub/Ubl结合酶的已知目标.
- 对于hHERC5和mHERC6的不同基质选择性,可以了解ISG15结合的调节.
- 这些发现对理解HECT域连接酶在细胞过程和免疫中的更广泛的功能作用有影响.
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